package com.twitterapime.xauth.encoders;

public final class Base64Encoder
{
  private static final char last2byte = (char)Integer.parseInt("00000011", 2);
  private static final char last4byte = (char)Integer.parseInt("00001111", 2);
  private static final char last6byte = (char)Integer.parseInt("00111111", 2);
  private static final char lead6byte = (char)Integer.parseInt("11111100", 2);
  private static final char lead4byte = (char)Integer.parseInt("11110000", 2);
  private static final char lead2byte = (char)Integer.parseInt("11000000", 2);
  private static final char[] encodeTable = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/' };

  public static String encode(byte[] from)
  {
    StringBuffer to = new StringBuffer();
    int num = 0;
    char currentByte = '\000';
    for (int i = 0; i < from.length; i++) {
      num %= 8;
      while (num < 8) {
        switch (num) {
        case 0:
          currentByte = (char)(from[i] & lead6byte);
          currentByte = (char)(currentByte >>> '\002');
          break;
        case 2:
          currentByte = (char)(from[i] & last6byte);
          break;
        case 4:
          currentByte = (char)(from[i] & last4byte);
          currentByte = (char)(currentByte << '\002');
          if (i + 1 >= from.length) break;
          currentByte = (char)(currentByte | (from[(i + 1)] & lead2byte) >>> 6); break;
        case 6:
          currentByte = (char)(from[i] & last2byte);
          currentByte = (char)(currentByte << '\004');
          if (i + 1 >= from.length) break;
          currentByte = (char)(currentByte | (from[(i + 1)] & lead4byte) >>> 4);
        case 1:
        case 3:
        case 5:
        }to.append(encodeTable[currentByte]);
        num += 6;
      }
    }
    if (to.length() % 4 != 0) {
      for (int i = 4 - to.length() % 4; i > 0; i--) {
        to.append("=");
      }
    }
    return to.toString();
  }
}